Organs are composed of two or more primary tissues that serve the different functions of the organThe skin is an organ that has numerous functions provided by its constituent tissues

An organ is a structure composed of at least two, and usually all four, primary tissues. The largest organ in the body, in terms of surface area, is the skin (fig. 1.21). In this section, the numerous functions of the skin serve to illustrate how primary tissues cooperate in the service of organ physiology.

■ Figure 1.20 A cross section of a tooth showing pulp, dentin, and enamel. The root of the tooth is covered by cementum, a calcified connective tissue that helps to anchor the tooth in its bony socket.

Epidermis-epithelial tissue)

Stratum oorneum Stratum granulosum Stratum spinosum Stratum basale

Dermis (Connective tissue)

Hypodermis_

Epidermis-epithelial tissue)

Dermis (Connective tissue)

Hypodermis_

Stratum oorneum Stratum granulosum Stratum spinosum Stratum basale

Arrector pili muscle (Muscle tissue)

Sweat gland

Adipose tissue

Arteriole

Hair bulb

Venule

Motor nerve (Nerve tissue) ^^ nerve

Arrector pili muscle (Muscle tissue)

Sweat gland

Adipose tissue

Arteriole

Hair bulb

Venule

Motor nerve (Nerve tissue) ^^ nerve

■ Figure 1.21 A diagram of the skin. The skin is an organ that contains all four types of primary tissues.

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